mvpp2: sync only the received frame (e1921168) · Commits · 戴 / test

In the RX path we always sync against the maximum frame size for that pool. Do the DMA sync and the unmap separately, so we can only sync by the size of the received frame. Signed-off-by:

Matteo Croce <mcroce@redhat.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c

+7 −2

Original line number	Diff line number	Diff line
		@@ -2959,6 +2959,10 @@ static int mvpp2_rx(struct mvpp2_port port, struct napi_struct napi,
		if (rx_status & MVPP2_RXD_ERR_SUMMARY)
		goto err_drop_frame;

		dma_sync_single_for_cpu(dev->dev.parent, dma_addr,
		rx_bytes + MVPP2_MH_SIZE,
		DMA_FROM_DEVICE);

		if (bm_pool->frag_size > PAGE_SIZE)
		frag_size = 0;
		else
		@@ -2976,8 +2980,9 @@ static int mvpp2_rx(struct mvpp2_port port, struct napi_struct napi,
		goto err_drop_frame;
		}

		dma_unmap_single(dev->dev.parent, dma_addr,
		bm_pool->buf_size, DMA_FROM_DEVICE);
		dma_unmap_single_attrs(dev->dev.parent, dma_addr,
		bm_pool->buf_size, DMA_FROM_DEVICE,
		DMA_ATTR_SKIP_CPU_SYNC);

		rcvd_pkts++;
		rcvd_bytes += rx_bytes;

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